GNU leg (Libraries and Engines for Games) is a developing tool
written in C that provides tools ranging from simple libraries to
resource editors designed to make game creation easier. Technically,
GNU Leg is primarily a set of libraries that operate at various
levels.

Various styles of games can be made using GNU Leg. It's designed to
be generic and granular so that users are able to extend it or modify
some of it as they wish. Although performance will be good in most
cases, it might be slightly slower. However, GNU Leg is designed to
make things easier to understand, to make, to modify, to
personalize...

GNU Leg is mainly intended for users of GNU/Linux (and other Free
Unix-like operating systems). It is aimed mostly at programmers at
this time. However, in the future it will provide tools for people
who wish to modify existing games.